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REFERENCES 1. ALBERT, A.; BORTH, R.; DICZFALUSY, E.; LORAINE, J. A.; LUNENFKLD, B.; MC-ARTHUR, J. W., and ROSEMBERG, E.: Collaborative assays of two urinary preparations of human pituitary gonadotropin (Letter to the Editor), / . Clin. Endocrinol. & Metab. 18: 1117-1123 (Oct.) 195S. 2. ALBERT, A.: Preparation of a provisional standard for urinary gonadotropin of men, Proc. Staff Meet., Mayo Clin. 31: 341-344 (May 30) 1956. 3. GORBMAN, A.: Ultrafiltration of urine for collection and biological assay of excreted hypophyscal hormones, Endocrinology 37: 177-190 (Sept.) 1945. 4. BORTH, R.; DICZFALUSY, E. ; and HEINRICHS, H. D.: Grundlagen der statistisehen

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